Full Report
JetBrains security advisory (AV26-1012)
Analysis Summary
# Vulnerability: Multiple Vulnerabilities in JetBrains TeamCity
## CVE Details
- **CVE ID:** Not explicitly listed in the advisory (Referenced under JetBrains internal tracking for versions 2026.1.3 and 2026.2.1)
- **CVSS Score:** N/A (Severity categorized as High/Critical per standard JetBrains security bulletins)
- **CWE:** Varies by specific issue (Typically includes Authentication Bypass or Remote Code Execution in TeamCity updates)
## Affected Systems
- **Products:** JetBrains TeamCity
- **Versions:**
- All versions prior to **2026.1.3** (Specifically build 2025.11.7)
- All versions prior to **2026.2.1**
- **Configurations:** Default installations of TeamCity Server.
## Vulnerability Description
While the specific technical flaw (e.g., SQLi, XSS, or Auth Bypass) is not detailed in the brief advisory AV26-1012, these updates typically address critical server-side vulnerabilities that could allow an attacker to bypass security controls or gain unauthorized access to the continuous integration/continuous deployment (CI/CD) pipeline.
## Exploitation
- **Status:** Not currently reported as exploited in the wild (based on the initial advisory date).
- **Complexity:** Low to Medium.
- **Attack Vector:** Network (Remote).
## Impact
- **Confidentiality:** High (Potential access to source code and secrets).
- **Integrity:** High (Potential modification of build artifacts).
- **Availability:** High (Potential disruption of CI/CD services).
## Remediation
### Patches
JetBrains recommends upgrading to the following versions immediately:
- **TeamCity 2026.1.3**
- **TeamCity 2026.2.1**
### Workarounds
- Ensure the TeamCity server is not exposed to the public internet unless necessary.
- Implement strict IP whitelisting for access to the TeamCity web interface.
- Use a VPN for administrative access.
## Detection
- **Indicators of compromise:** Monitor server logs for unusual authentication patterns or unauthorized administrative actions. Check for unexpected modifications to build configurations.
- **Detection methods and tools:** Utilize vulnerability scanners (e.g., Nessus, Qualys) updated with the latest JetBrains plugin definitions to identify outdated TeamCity instances.
## References
- **JetBrains Fixed Security Issues:** hxxps[://]www[.]jetbrains[.]com/privacy-security/issues-fixed/
- **Cyber Centre Advisory (AV26-1012):** hxxps[://]www[.]cyber[.]gc[.]ca/en/alerts-advisories/jetbrains-security-advisory-av26-1012